I have used various 6MMs for years, but not the 6/284. When it comes to a big game bullet, I tend to use either the 105 Grain Speer, or more recently, the 100 Grain Sierra Spitzer.
I used a 6MM Remington in Africa, on kudu, and warthog. The 100 Sierra passed completely through both lungs on the kudu and exited. I was not happy using that gun, at the time, having brought it, mainly for jackal, but it worked.
As a big game bullet, in that bore, it's hard to beat.
Good hunting. LB